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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68d9b251dcb2d5765834d103b6810a7e9702db803280ebdc91211f771f3bfaf3' 
  AND token = 'HF244qvmQf8AJRxMVKHjxmAEvSJdkSIaNTbeDg8TD04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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