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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '908600cc2e932cb07bee67b4b927b054abf499a2505753b0a60ac30de9568f24' 
  AND token = 'Jf4TgJJKUFisyhuCixd7F0uqF75SNCvIOazbtp4kfIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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