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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd3b58ca0e1b0c51a01d9c18e5387eb3f4ea280b8a1ab2473b2778bc70cf99e0' 
  AND token = 'YSWkOLKA53yyQ35UJKVQArS6UDU16kU6adUZ27HTQOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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