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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cf212fff4a6ce20d0cee1fb795ee681f5b9dce6340486e6328e4253671f79d5' 
  AND token = '6vArSg6lpxz3aeS9Zp0vU5zjlHISt+y8zj41zzXIqLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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