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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2458ed5ae545eefbd7bbcbb96bb9bd7fdd495673f11ad1b9a5f94541bd6c25f' 
  AND token = '0wFsFeqe6VD6uTv196mb0Rzs87E62HgYUmCM98jQUMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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