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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2792ccdd5ef6596d816632b6b69b23b7072fb1b612c48dcc666e66ed2677e70c' 
  AND token = 'cpnknK1PVaXHV1ul/RswPbqP/EB2+bj9AVJ0Am0WkhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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