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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ed0afa647789589a4adea67d0f046b9f00d5bacedb0c4d539bbd44d3ff7f28e' 
  AND token = 'Ym5mb6llTcIXza6yLb0MGzZ/lx5tnnenZOhLQ04zbuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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