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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e41149a93b9e7124d634eb94fa38f127c4ec1aaff016059dc5645b8a6671ea9' 
  AND token = 'pLJ6jpS2VxPuGw1A7+Hdb/arbCAcxv+cvct+csm6SxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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