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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db51d087847fe4d9ce0cce41091ffd2466918805883de28eecbfa982a0c9c276' 
  AND token = 'wDumspigxJIyuO3TwLKtkfn+CCj3HMf6PLl8I1vi8dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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