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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad444064a6af3fc410bc4db7803e30bd7cf971dd7eb1bc620b0b98f871e5d543' 
  AND token = 'suftbPORIptXs3onXncFHSnecz9TtnPV3fsh73VC7iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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