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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8b87a073f60f154e2702820f3a0b9f1b7109e33dda639350defcfa30ecc6ab4' 
  AND token = 'N2o6E1vR28hirPKlF6AV3lMZ2DC6XKBzv0y/Y0e3IB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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