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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '943703b3fbdf14b091072a6ebf0d9a3c623b75e954ad9d672c75a80a4ed3e2bd' 
  AND token = 'Kbnvdil66qMNl06+73cjoPzoaTa7dsnkUV2a0aob8cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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