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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4b6cacb18b065c1fb0720cf05166f02a84f492797cb2d1300fa4f8d77906933' 
  AND token = 'Z+RreyhNP7pZFsM1uEQJ2Bj0T+ySZEF3N3wWd3HPUAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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