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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '051ddbea0e6fe7df59f967b31d443fc8f64f7400105b8473c5524e72a1e6e773' 
  AND token = 'L75a2Mzj4CSRa6jMmm9a2MllkYgInA/0taM8C/2BdY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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