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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7266298eec0ab8ed3e47a60ff814487ba211da1b5f2927bbf6ac5aa8978037d' 
  AND token = 'Unc45d4R4SDv7QtYQ+KTqS2QZHOOwJspdzBcLcMHidA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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