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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6482abc54b1a1f7d16a7e0d1a85beb589fbeb35c5ccae0bc80291e7eb442487' 
  AND token = 'eJ2p6mWuTyGEJ9/eafHLGFROQy/XF1M9SGyEQC0Htyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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