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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08bfb1f44ba66f70f5fa007b37504951d4de18f774c6b61743e967d3ac49ef18' 
  AND token = 'nq//VTsPj6G7uuEDSkNlN6WdFzy5ny13oDvFOK28eh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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