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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be5762706e2470071362d14aaf23f2eff29e9b6bff3644d40ad1415f677af80f' 
  AND token = 'nWJY+1f+WG6gIJFlcI0lFDQ97YacaqXo5ApIR9JAlXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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