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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a433953cd735089564fa8a117965e06b9a8e6cfd4970f5f913b4b5a21b63e63' 
  AND token = 'yDoeTgGXbxbR57AAbQI5D4TY1zsHVpDXt35rNqYoPT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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