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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8c01a8c0cddb27a76fb0e7c487c2569202ce472b75b1caf7b446f8cf2dcbd1d' 
  AND token = 'Hm/l0Ff627xc7Kgi4KMBqU+wDtskRWiz4a15S485EpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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