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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87986a1a339447a8122e9ffa2dc8ba3b13ee1d7689bac1be2a656957450fb19a' 
  AND token = '8d8iltG+D8osM67d15xvxEXDt18O3GOuvBmoRmot/C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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