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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8230b71a93dc490b0860d60949bd975740d6d5490f1ce622cb89e989b5f8521f' 
  AND token = 'Z6C5EAWuduKnF1/WZm0pr0L+uFJUsiXQBL/Yb+eAA0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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