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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0fa4f9ced0791e3baf7a32eea990e6f71d524c6b7f7a9f8742dbdecaf8177e4' 
  AND token = 'USZCw+yF10+Sh3i/xFU4sxL+nAFgAxEfzFyA9pspZ+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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