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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '171e27bce81228228814dc77f8d8b8fe9eff06e4b62580df7ce0262e994d4a1e' 
  AND token = 'T3ftFc2cqeVAYIgDDpBubttaj90QEvCXiEiUjKy7P7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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