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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0a671579cd1b857d02f1adcb798d0c04f7345a607bc5a23545d12eee4d28048' 
  AND token = '7BqgCjiT3ERNobfvt4nWjs4v0EtbsIuNuAyH/ibMWx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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