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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54da1109ddebea56e5d5462b6753d51fa54bf1d7af95125dc611e04e2d6266ec' 
  AND token = 'HQXWbk/xma9RhGTDANp2e2pDMMsAufhWlMDI8YJjT1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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