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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42990f0796d2e95bff363acc3a629ea157df5e7ba64bc616f2d82576ce62d329' 
  AND token = 'hndu7CofAeWkx6UxcXiCL4qP8WX9IMoQ/mOh8NELGgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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