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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f70540958d015deb19a784d2d6139cec43c9553ff84d641caf190cec75a31d1' 
  AND token = 'yBCeKE027ZfQxo9+VB4P4c7PqOHpiNs0qXG/IIM32NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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