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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19d70e07b4392c7e28e72294a3428dbc9384836d054715cb22c4a871c9fe41a1' 
  AND token = 'z4gMyoET/bEI9AoNQZNW4j6+da6fPrdiwxU08wUSw0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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