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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcff99280e075b7488c11a94af81898b71691d7adcb3de61baaeac09132d6043' 
  AND token = 'ma+m8KyBZibMa35dO0tflwrmEr3wLC4ZJvze78TkkMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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