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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5beffb71198701fce76a9e5bebd2785e8e6bf0187087ee6728f4f60f007f33bb' 
  AND token = 'T3NdY3agHzsMrbq5RaHIf1+pPQvvifoPlPxw5rc9T2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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