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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '773b9a82b012f18a76e4fa0d1c626fade2acef5f663b2537ed4867ba2ce32099' 
  AND token = '0aWR3qkVDZwEQNNqOAkuti9r4b0QfQMZM6qP+VT+vis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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