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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eae2332e5c2f10754e535fa20c4ce0584238d28c7ac6be09257925cfd47f445f' 
  AND token = '7MEFx6sTFhBNOgQFOnR0o8oMcLIZq88+/EwF2ITfofs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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