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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ea99c04fef24f319973c30943fa2416608f16a7a458ef8664cc68bd8c3b6e98' 
  AND token = 'ivuYAIQmSXMNoz+n2UVoDNWvsiFOEoMSBcq3y2/O6R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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