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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15aadb33a978a2936310856e7845e259318db7698079cd1abc404602bd2c05b0' 
  AND token = 'q/E4TSg05kiUAInxrWk43WjXgXfWghZFNUtEE3VEG8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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