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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26a81e8d83527264d45d7bdaa1c1253d23fc9934335ee215f4e943fcced263e4' 
  AND token = 'HUT6kziEoEO/eCqOrfmwcLH0XkJ77iFmml79TIR0Qas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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