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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12b6080c6944b65572146832a6542b6760076d5a2f9a72bf611a6047ac5bbc8c' 
  AND token = 'QIsNDLbwY/TfEZb5cx+zBLZlwqjS6NyXqbJmHNydR5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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