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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b08ee05914ccae1261292fcbdda0fe1acc94e41e9f7e8ce6d91834973f7d11a' 
  AND token = 'T2CNWdJLvHd9y67bPx2BUj+CacO6wj7ixxyrgQMblzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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