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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'feefead13e2f60991ef3b9040aacd04815dd2c2159d4f7c1ec8cba9b778656aa' 
  AND token = 'NaFMWAb/ay9Mw9uAjN07jSzENgzVriJQ1PojsL9Jk3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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