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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '228449dfbc0904b301cf731e1997326f49e3d01e45548f8253f45439257db12e' 
  AND token = 'oUKKr+1yLKdSTz5Q0b0TQTwaILCjXbnm/qK313ob4qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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