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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '593a948b020e7bebab2f93647b847bb4df7e68f35413db28dc98d6aeab42a6e0' 
  AND token = 'LogICFemonBmpPoY/xnDTrNazujXkrm1fRpVDTe8ui0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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