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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9f2fef977c0af2a39a5bfc2d80394af6cdb5988e873a227547b2c1e3dae9ac6' 
  AND token = '+yxEB5mY4x2uNlNaxVqePPi4rbv5lrcczo38y4LsGr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}