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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0b248ae00c652c20f11d7ec3c9f3e4f2563c346fd2af5efedb280e3ff8604ce' 
  AND token = 'Yu6H7xS2TPKvNNgO9IBLe9SEvNXOjt2E2ScWf3X7yic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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