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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87c683c2d62b21a9a4444ec12257ac9eae6931fb04dc7d10c319530d1f029f9a' 
  AND token = 'hKxWAnKwxkRmT52PU6tfqL1QU8hxxlCPk2j8Rwa8aZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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