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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f696159725a75344537aca58e085ffa7ce21904c2c8564431fb4b55cd526590' 
  AND token = 'OcXT9lZdJslQR47QMRwQCtu6Lj+5IQkU7TP/2nl34p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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