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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a66ef9fbbed339091c55f138caa52292ccb155d6972f4b3d74a4a64bc1dcd31' 
  AND token = 'rc2RofIiuQjkazHcJs9CLi+avUGjc/3u7jEKrxYaUVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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