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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f7d92e87e9efb78b730d8f9eb8148c751412e1839ad0cfe10f76523718e4405' 
  AND token = '02XQiEZcoiRJUwIvwzUsdx2/c2xa40tAjgjB0VnUU2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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