SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5006d4b7e73615aa58d5ac55fdbabf23c551aba8bf428e12fccc5d74e07fbc46' 
  AND token = 'NfOTr6cPE5n+MVhUlmQs9uVP+JQeeqTHfwJiCZdBGYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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