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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ec8ede0424545b7a4530cb4fa914256f2b625c9b23d46ad976ecf34d71f3562' 
  AND token = 'KSY0AF3AMO7mpXMjkGmPU8TwAIyRbSrrQs2tk7RMEz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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