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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b0c379e334019a3f4ce85fffd77f7107641132532218784f3cc69e91ac37849' 
  AND token = 'X9s6tBIs+nGaQ9F7CqmpFqOwXQ281rA5hA2Ae0ztNEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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