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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36c45974c97bf03f6751ee3d38fda97443afc8560316216436e63975b7e7caae' 
  AND token = 'n8DG6j3Y4HydrrwYfx56P+sLlcQ+h+FjDgYY2j1ojLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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