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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e99b84d173ead8d182c17a5532d947fe5411e8287adb22f3dad82ca1ecefab6' 
  AND token = 'Kpx3hU6dPPCeMkpLDz72jYH8PkR/tBdl+QikWmq5xpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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