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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c59a6c74ca7419b593e7db385b4d441bef9d21cb923b40b382850ec421a7bd5a' 
  AND token = 'y9xXG0dvKcT1od7TqryiITt6G9cBW6ir2eyh0LHqVf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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