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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e097eb9c69dc07c1f666e64cda827d1124683f71868d566f6a17e7ed1e3a724' 
  AND token = '7ipKu/o5EcXBLkKme27qnsKCN8BDAycsTb3agHEotdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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