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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46b58afc7e4d73eb8a02e3776bea6d838877efe804c64310c8254905c872fd98' 
  AND token = 'z7cj/A2QNT/ZW0Cv0FKPfAMccvMc/ajg8kDk/X3/4+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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