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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07ad71255984cb02a68372adb75e27ffa08c7b63b587688260762c2568abd34e' 
  AND token = 'YWnF9cKGQ1HN3vMinBSTNZy4ui9mQCizDM0gDpg0atU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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