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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '826067310515382e044c41b105ce91c4c6f2bb9c3b6774fda0776332cab42aeb' 
  AND token = 'wnJRpumn7SrnkqjpsX8EKimzVS931Xry3bW0fr9hXb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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