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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cbe6f10b776462a3822c4733e125fd00ad6314c275fd1fc518b33dcb6737f95' 
  AND token = 'm2bC6oNKiKlg/vdvTuf8lMV4QJQgl6Vf7VdtONVyqTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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